Roof airbag for vehicle

Abstract

A roof airbag for a vehicle includes: an airbag cushion located at a roof panel of the vehicle and configured to be unfolded from a first side portion to a second side portion of the roof panel during an operation of the airbag cushion; a first seam portion extended in a direction intersected with an unfolded direction of the airbag cushion and allowing upper and lower surfaces of the airbag cushion to be in contact with each other; and an inflator coupled to the first side portion of the roof panel, and connected to the airbag cushion and configured to inject gas into the airbag cushion so as to allow the airbag cushion to be unfolded from the first side portion to the second side portion of the roof panel.

What is claimed is: 
     
       1. A roof airbag for a vehicle, the roof airbag comprising:
 an airbag cushion located at a roof panel of the vehicle and configured to be unfolded from a first side portion to a second side portion of the roof panel during an operation of the airbag cushion; 
 a plurality of first seam portions extended in one direction that is intersected with an unfolded direction of the airbag cushion and joining upper and lower surfaces of the airbag cushion to each other; 
 a plurality of second seam portions separated from the plurality of first seam portions in the unfolded direction of the airbag cushion, and allowing the upper and lower surfaces of the airbag cushion to be in contact with each other, and being extended in the direction intersected with the unfolded direction of the airbag cushion with lengths relatively shorter than lengths of the plurality of first seam portions; and 
 an inflator coupled to the first side portion of the roof panel, and connected to the airbag cushion, and configured to inject gas into the airbag cushion so as to allow the airbag cushion to be unfolded from the first side portion to the second side portion of the roof panel, 
 wherein each of the plurality of first seam portions has a first end and a second end, the first end and the second end being connected by a straight line, 
 wherein each of the plurality of second seam portions has a first end and a second end, the first end and the second end being connected by a straight line, 
 wherein the plurality of first seam portions are arranged in parallel with the plurality of second seam portions in the unfolded direction, with the plurality of second seam portions arranged between the plurality of first seam portions. 
 
     
     
       2. The roof airbag of  claim 1 , wherein the plurality of first seam portions are formed by being spaced apart from a lateral end of the unfolded airbag cushion toward a central portion of the airbag cushion. 
     
     
       3. The roof airbag of  claim 1 , wherein the plurality of second seam portions are arranged to be spaced apart from each other in an extended longitudinal direction thereof. 
     
     
       4. The roof airbag of  claim 1 , wherein the plurality of second seam portions are formed by being spaced apart from a lateral end of the unfolded airbag cushion toward a central portion of the airbag cushion. 
     
     
       5. The roof airbag of  claim 1 , wherein the inflator is coupled to the roof panel by being connected to both a first bracket and a clamp. 
     
     
       6. The roof airbag of  claim 1 , further comprising:
 a second bracket coupled to the first side portion of the roof panel of the vehicle and coupled to the airbag cushion. 
 
     
     
       7. The roof airbag of  claim 1 , further comprising:
 a guide device coupled to the roof panel of the vehicle, and connected to a lateral end of the unfolded airbag cushion, and extended in the unfolded direction of the airbag cushion to guide an unfolding of the airbag cushion from the first side portion to the second side portion of the roof panel. 
 
     
     
       8. The roof airbag of  claim 7 , wherein the guide device comprises: a wire mounted to the roof panel of the vehicle and extended in the unfolded direction of the airbag cushion; and a connecting portion connecting the airbag cushion to the wire. 
     
     
       9. The roof airbag of  claim 1 , wherein the plurality of first seam portions and the plurality of second seam portions are arranged such that the airbag cushion contracts in the direction parallel to the unfolded direction of the airbag cushion during an unfolding thereof thereby minimizing a non-protecting area associated with the airbag cushion.